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If f(x)= 5x^3- 2x+8 and g(y)= 6y-4, then g(f(x)) =

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If f(x)= 5x^3- 2x+8 and g(y)= 6y-4, then g(f(x)) = [#permalink]

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New post 23 Apr 2012, 05:33
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If \(f(x)= 5x^3- 2x+8\) and \(g(y)= 6y-4\), then \(g(f(x)) =\)

A. \(11x^2+4x+4\)

B. \(11x^2-12x+44\)

C. \(8x^3-8x+32\)

D. \(30x^3+4x+4\)

E. \(30x^3-12x+44\)
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Re: If f(x)= 5x^3- 2x+8 and g(y)= 6y-4, then g(f(x)) = [#permalink]

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New post 23 Apr 2012, 05:39
dzodzo85 wrote:
If f(x)= \(5x^3- 2x+8\) and g(y)= \(6y-4\), then g(f(x)) =

A.\(11x^2+4x+4\)
B.\(11x^2-12x+44\)
C.\(8x^3-8x+32\)
D.\(30x^3+4x+4\)
E.\(30x^3-12x+44\)


g(f(x)) = 6(f(x)) -4 = 6(5x^3- 2x+8) - 4 = 30x^3-12x+44 =>E
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Re: If f(x)= 5x^3- 2x+8 and g(y)= 6y-4, then g(f(x)) = [#permalink]

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New post 23 Apr 2012, 05:44
dzodzo85 wrote:
If f(x)= 5x^3- 2x+8 and g(y)= 6y-4, then g(f(x)) =

A. 11x^2+4x+4
B. 11x^2-12x+44
C. 8x^3-8x+32
D. 30x^3+4x+4
E. 30x^3-12x+44


\(g(f(x)) = g(5x^3- 2x+8)\), now since \(g(y)= 6y-4\) then substitute \(y\) with \(5x^3- 2x+8\): \(g(f(x)) = g(5x^3- 2x+8)=6(5x^3- 2x+8)-4=30x^2-12x+44\).

Answer: E.
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Re: If f(x)= 5x^3- 2x+8 and g(y)= 6y-4, then g(f(x)) = [#permalink]

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New post 03 Jul 2013, 01:24
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Re: If f(x)= 5x^3- 2x+8 and g(y)= 6y-4, then g(f(x)) = [#permalink]

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New post 15 Jun 2018, 23:25
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Re: If f(x)= 5x^3- 2x+8 and g(y)= 6y-4, then g(f(x)) =   [#permalink] 15 Jun 2018, 23:25
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